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The single called ancestor theory is also known as the monogenism theory, which proposes that all humans are descended from a single pair of ancestors. This theory contrasts with the polygenism theory, which suggests that different groups of humans have separate origins.

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What theory stated that organisms evolved from a common ancestor?

The theory that states organisms evolved from a common ancestor is the theory of evolution proposed by Charles Darwin in his book "On the Origin of Species" published in 1859. Darwin's theory of evolution by natural selection explains how species change over time through the process of adaptation to their environments.


Why do most scientist believe that all life on earth evolved from a single-felled ancestor?

Scientists believe in the theory of universal common descent because it provides a coherent explanation for the diversity of life on Earth. Evidence from various fields such as genetics, biochemistry, and the fossil record supports the idea that all living organisms share a common ancestor. Additionally, the theory has successfully predicted and explained many observations in the biological world.


What does evolution theory states?

The theory of evolution states that all species of organisms have descended from a common ancestor through a process of gradual change over long periods of time, driven by natural selection acting on heritable variations within populations. It explains the diversity of life on Earth and how species adapt to their environments.


Why do most scientists believe that all life on earth evolved from a single-called ancestor?

Scientists believe in the theory of universal common ancestry because of evidence like the genetic code shared by all living organisms, similarities in biochemical processes, and the fossil record showing the progression of life forms over time. This theory provides a coherent explanation for the diversity and unity of life on Earth.


The idea that all continents were once a single landmass but are now separate is called the theory?

The theory that all continents were once joined together in a supercontinent called Pangaea and have since drifted apart is known as the theory of continental drift. This theory was proposed by Alfred Wegener in the early 20th century and later developed into the theory of plate tectonics.